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t segitiga = √6^ + 3^
= √ 36+9=√45= 3√5 cm
3 diperoleh dari 6:2
luas segitiga = a.t/2
= 6.3√5/2
= 9√5 cm2
luas permukaan limas
= 9√5 × 4
= 36√5 cm2
=36-9= 27
= akar 27= 3akar3
luas permukaan= luas alas+ 4.luas sisi tegak
= (6.6)+(4. 6. 3akar3)
= 36+ (216.3akar3)
= 36+648akar3
=684akar3 cm
insyaallah bener , jadikan terbaik ya? :)